(1)sin(-x-5π)· cos(x-π/2)-tan(2π-x)=( )
问题描述:
(1)sin(-x-5π)· cos(x-π/2)-tan(2π-x)=( )
(2)0≤x≤2π且sinx>根号3 cosx,则x的取值范围为( )
(3)已知向量a=(sinθ,-2),b=(1,cosθ)且a⊥b(0
答
(1)[sin x]^2+tan x
(2)π/3